| L & T Premier Properties Ltd | Real estate | 2021 |
| L&T Patient Transport Services Limited | Health & social care | 2015 |
| LA Tutors Ltd | Education | 2026 |
| Lady Vintage Limited | Wholesale & retail | 2011 |
| Laleham Ventures Consulting Ltd | Professional & scientific | 2010 |
| Lamour Group Ltd | Professional & scientific | 2024 |
| Lancott Limited | Professional & scientific | 2017 |
| Landricombe & SON Limited | Construction | 2006 |
| Langport Property Limited | Construction | 2024 |
| Langtons Farm Partnership LLP | | 2009 |
| Larch Ltd | Professional & scientific | 2024 |
| Larkstel Associates Ltd | Wholesale & retail | 2020 |
| Lasers in the Jungle Games Ltd | Information & communication | 2024 |
| Lavish Food and Wine Ltd | Wholesale & retail | 2024 |
| Law of Attraction Coaching Limited | Professional & scientific | 2020 |
| Lawrence & Warwick Construction Limited | Construction | 2013 |
| Layland Johnson Properties Ltd | Households | 2022 |
| Layland Sales Ltd | Wholesale & retail | 2025 |
| LC in Education Limited | Education | 2016 |
| LCP Accounting LLP | | 2015 |
| LDM Properties (South) Ltd | Construction | 2021 |
| Lead Stack Systems Limited | Information & communication | 2026 |
| Leading Edge Management Consultancy Limited | Professional & scientific | 1994 |
| Leadout Events Limited | Professional & scientific | 2024 |
| Lealt Stratigraphic Consultants Limited | Professional & scientific | 2017 |
| Leave a Little Sparkle Ltd | Administrative & support | 2020 |
| Lees Hill Consulting Limited | Professional & scientific | 2021 |
| Libra Motor Finance Holdings Limited | Financial services | 2022 |
| Libra Motor Finance Limited | Financial services | 2022 |
| Life Church Hook | Other services | 2013 |
| Life on Show Limited | Information & communication | 2008 |
| Life VIA Light Limited | Professional & scientific | 2016 |
| Lifeline Horizon Limited | Other services | 2025 |
| Lifetime Mortgage Finance Limited | Financial services | 2015 |
| LIL25 Limited | Real estate | 2025 |
| Lilliput Properties Ltd | Real estate | 2016 |
| Lily Hill Australian Labradoodles Ltd | Agriculture & fishing | 2024 |
| Lincolnshire Professional Services Ltd | Administrative & support | 2021 |
| Line Calls Limited | Real estate | 2001 |
| Lionheart Trading Ltd | Wholesale & retail | 2012 |
| Lithium ION Group Ltd | Financial services | 2022 |
| Little Ember Works Ltd | Real estate | 2025 |
| Little Joys Clothing Limited | Wholesale & retail | 2022 |
| Littleroseandpearl Ltd | Real estate | 2025 |
| LJ Payne Brickwork Limited | Construction | 2021 |
| LL Influence Limited | Professional & scientific | 2024 |
| Lmac Media Ltd | Information & communication | 2025 |
| Loddon Mill Carpets Ltd | Wholesale & retail | 2015 |
| Loddon Transformation Ltd | Information & communication | 2024 |
| LOG Cabins for Sale UK Ltd | Construction | 2019 |
| Logic Lattice Limited | Information & communication | 2017 |
| Logicsolve Ltd | Professional & scientific | 2004 |
| Lombardini (UK) Limited | Wholesale & retail | 1989 |
| London Capital Returns Ltd | Financial services | 2023 |
| Longcross Securities Limited | Wholesale & retail | 1981 |
| Longreach Farms Limited | Real estate | 2023 |
| Longstones Minerals Ltd | Professional & scientific | 2018 |
| Lonsdale Car Sales Limited | Wholesale & retail | 2007 |
| Lora's Lops Ltd. | Education | 2022 |
| Lord Wandsworth College | Education | 2011 |
| Louise Sims Consulting Ltd | Professional & scientific | 2026 |
| LP Designs Ltd | Professional & scientific | 2026 |
| LSA Risk Solutions Ltd | Financial services | 2015 |
| LSM Cars Limited | Wholesale & retail | 2020 |
| Luckett Holdings Ltd | Professional & scientific | 1986 |
| Luckyvilla Holdings Ltd | Extraterritorial | 2019 |
| Lucy Eadie Interiors Limited | Administrative & support | 2009 |
| Lupo Engineering Ltd | Professional & scientific | 2021 |
| Lutra Lodge Limited | Construction | 1980 |
| Luxetr Consulting Ltd | Information & communication | 2018 |
| LWC Enterprises Limited | Education | 1987 |
| LYC Logistics Ltd | Wholesale & retail | 2019 |
| Lynx Technik (UK) Limited | Wholesale & retail | 2003 |
| Lyons + Sleeman + Hoare Limited | Professional & scientific | 2009 |
| Lyons Builders Organisation Limited | Construction | 2018 |
| M & JG Consulting Limited | Professional & scientific | 2019 |
| M & L Roofing Ltd | Construction | 2025 |
| M and K Payne Carpentry Services Limited | Construction | 2010 |
| M Carey Property Services (UK) Ltd | Administrative & support | 2025 |
| M Claughton Ltd | Real estate | 2020 |
| M D Leaver Consulting Ltd | Professional & scientific | 2026 |
| M Lewis Transport Operations Ltd | Professional & scientific | 2022 |
| M W Leadworks Ltd | Construction | 2011 |
| M&Jp Limited | Real estate | 2026 |
| M&K PUB Company Ltd | Hospitality | 2025 |
| M&N Drylining Limited | Construction | 2025 |
| M. Bromfield & Associates Limited | Professional & scientific | 2024 |
| M.L.H Builders Limited | Construction | 2013 |
| M3 Fire Ltd | Professional & scientific | 2022 |
| Mackenzie Wolf Limited | Professional & scientific | 2022 |
| MAD Home Improvements Ltd | Construction | 2019 |
| Magic Monthly Ltd | Wholesale & retail | 2022 |
| Magnolia Grove Investments Limited | Real estate | 2017 |
| Maintainiacs Ltd | Administrative & support | 2026 |
| Maitland Marketing Group Ltd | Administrative & support | 2015 |
| Maize Gardens (Warfield) Management Company Ltd | Households | 2024 |
| Make IT SO (VA) Ltd | Administrative & support | 2020 |
| Make ME Bridal Ltd | Information & communication | 2016 |
| Male Transport Services Ltd | Transport & logistics | 2024 |
| Malt Consulting Limited | Professional & scientific | 2019 |